Send asset downtime status along with asset details (#1794)

* Queryset to send all related assets record status

* update serializer to send down field

* refactor

* pass down along with assets

* refactor

* update tests

* annotate in get_queryset

care/facility/api/serializers/asset.py

@@ -149,11 +149,15 @@ class AssetSerializer(ModelSerializer):
     last_serviced_on = serializers.DateField(write_only=True, required=False)
     note = serializers.CharField(write_only=True, required=False, allow_blank=True)
     resolved_middleware = ResolvedMiddlewareField(read_only=True)
+    latest_status = serializers.CharField(read_only=True)
 
     class Meta:
         model = Asset
         exclude = ("deleted", "external_id", "current_location")
-        read_only_fields = TIMESTAMP_FIELDS + ("resolved_middleware",)
+        read_only_fields = TIMESTAMP_FIELDS + (
+            "resolved_middleware",
+            "latest_status",
+        )
 
     def validate_qr_code_id(self, value):
         value = value or None  # treat empty string as null

care/facility/api/viewsets/asset.py

@@ -1,6 +1,6 @@
 from django.conf import settings
 from django.core.cache import cache
-from django.db.models import Exists, OuterRef, Q
+from django.db.models import Exists, OuterRef, Q, Subquery
 from django.db.models.signals import post_save
 from django.dispatch import receiver
 from django.http import Http404
@@ -262,6 +262,13 @@ def get_queryset(self):
             queryset = queryset.filter(
                 current_location__facility__id__in=allowed_facilities
             )
+        queryset = queryset.annotate(
+            latest_status=Subquery(
+                AssetAvailabilityRecord.objects.filter(asset=OuterRef("pk"))
+                .order_by("-created_date")
+                .values("status")[:1]
+            )
+        )
         return queryset
 
     def list(self, request, *args, **kwargs):

care/facility/tests/test_asset_api.py

@@ -52,6 +52,7 @@ def test_create_asset_with_warranty_past(self):
     def test_retrieve_asset(self):
         response = self.client.get(f"/api/v1/asset/{self.asset.external_id}/")
         self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertIn("latest_status", response.data)
 
     def test_update_asset(self):
         sample_data = {